An Extremely Aberrant Subtype of Hepatitis B Virus Genotype D in Iran

AUTHORS

Seyed Reza Mohebbi 1 , Samad Amini-Bavil Olyaee 1 , Narges Zali 1 , Faramarz Derakhshan 1 , Farzaneh Sabahi 1 , Mohammad Reza Zali 2 , *

1 Research Center for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, IR-Iran

2 Research Center for Gastroenterology and Liver Diseases, [email protected], IR-Iran

How to Cite: Mohebbi S, Olyaee S, Zali N, Derakhshan F, Sabahi F, et al. An Extremely Aberrant Subtype of Hepatitis B Virus Genotype D in Iran, Hepat Mon. Online ahead of Print ; 9(1):73-75.

ARTICLE INFORMATION

Hepatitis Monthly: 9 (1); 73-75
Article Type: Case Report
Received: September 23, 2008
Accepted: October 16, 2008

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Abstract

Background and Aims: Hepatitis B virus (HBV) infection is a global health problem, with more than 350 million people chronically infected worldwide. Previous studies revealed that ayw2 is the predominant subtype in Iran. There are also some reports other HBV subtypes including ayw1, ayw3 and ayw4 which are widespread subtypes of genotype D. In this study, we reported on an exceptional and extremely rare subtype of HBV genotype D in an Iranian patient chronically infected with HBV who was also co-infected with hepatitis delta virus (HDV). 

Methods: The HBV and HDV genotypes and sub-genotypes were determined by polymerase chain reaction (PCR) followed by direct sequencing and phylogenetic analysis. The HBV subtype was determined from the amino acid sequence of the region of viral genome encoding the hepatitis B surface antigen (HBsAg).

Results: Phylogenetic analysis based on the HBV S gene revealed that the patient was infected with HBV genotype D and sub-genotype D1. Further amino acid mapping on the amino acid of the HBV S gene sequence showed that the our patient who was chronically infected with HBV was infected by an unusual subtype "ayr" of the virus which is not typical for the genotype D of HBV. HDV phylogenetic analysis also revealed that the patient was co-infected with HDV clade1.

Conclusions: The results indicated the presence of the uncommon subtype "ayr" of HBV genotype D in Iran. This may show that the virus is going further evolution by changing its genome, though the importance of this atypical subtype in genotype D of HBV is still not clear and needs longitudinal studies.

Keywords

Hepatitis B Virus Genotype D Subtype ayr Hepatitis D Virus Iran

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